/**
* 挑出传入的所有点中重复的点~
*/
- (vector<b2Vec2>*)selectDuplicatedVertices:(vector<vector<b2Vec2>*>*)allVertices {
vector<b2Vec2> *target = new vector<b2Vec2>();
for(uint i = 0; i < allVertices->size(); ++ i) {
vector<b2Vec2> *poly = allVertices->at(i);
for(uint j = i + 1; j < allVertices->size(); ++ j) {
vector<b2Vec2> *beCompared = allVertices->at(j);
b2Vec2 vA;
b2Vec2 vB;
int counter = 0;
for(uint k = 0; k < poly->size(); ++ k) {
b2Vec2 m = poly->at(k);
for(uint l = 0; l < beCompared->size(); ++ l) {
b2Vec2 n = beCompared->at(l);
if((m.x == n.x && m.y == n.y) ||
(m.x <= n.x+_floatErrorRange && m.x >= n.x-_floatErrorRange &&
m.y <= n.y+_floatErrorRange && m.y >= n.y-_floatErrorRange))
{
if(counter >=2) {
break;
}
if(counter ==0) {
vA =b2Vec2(m.x,m.y);
}else {
vB =b2Vec2(m.x,m.y);
}
counter +=1;
}
}
}
if(counter == 2) {
target->push_back(vA);
target->push_back(vB);
}
}
}
return target;
}